We might be able to dump user_former_groups, change_tag_def and babel without privacy implications. Adding @Reedy for comment. (Feel free to remove yourself and/or redirect if you're not the right person to ping.)

@aaron This revision rEFLR848ef073fa89036c40c440016a8092690ddcf56b for FlaggedRevs seems to indicate that flaggedrevs_stats and flaggedrevs_stats2 are no longer used. Do you know or can you point me to someone who could verify that this is the case? If they aren't used, I will add them to my 'don't ever dump these' list. Thanks!

Some rebuilds for the wb_terms migration are taking place; I'll check again in the third week of January to see if all of the cleanup is done. We might be able to push this out for the Feb 1 run if all goes well.